diff --git a/jcparam.c b/jcparam.c
index 3020aab9..7ea0064e 100644
--- a/jcparam.c
+++ b/jcparam.c
@@ -419,14 +419,14 @@ jpeg_set_defaults (j_compress_ptr cinfo)
   jpeg_default_colorspace(cinfo);
   
 #ifdef C_PROGRESSIVE_SUPPORTED
-  if (cinfo->use_moz_defaults != 0) { // Disable this while working on trellis
+  if (cinfo->use_moz_defaults) { // Disable this while working on trellis
     cinfo->optimize_scans = TRUE;
     jpeg_simple_progression(cinfo);
   } else
     cinfo->optimize_scans = FALSE;
 #endif
   
-  cinfo->trellis_quant = (cinfo->use_moz_defaults != 0) ? TRUE : FALSE;
+  cinfo->trellis_quant = cinfo->use_moz_defaults;
   cinfo->lambda_log_scale1 = 16.0;
   cinfo->lambda_log_scale2 = 15.5;
   
diff --git a/jpeglib.h b/jpeglib.h
index 5f6e2b0c..66f51a10 100644
--- a/jpeglib.h
+++ b/jpeglib.h
@@ -376,7 +376,7 @@ struct jpeg_compress_struct {
   int smoothing_factor;		/* 1..100, or 0 for no input smoothing */
   J_DCT_METHOD dct_method;	/* DCT algorithm selector */
 
-  int use_moz_defaults; /* nonzero if using Mozilla defaults, 1=crush, 2=trellis */
+  boolean use_moz_defaults; /* nonzero if using Mozilla defaults, 1=crush, 2=trellis */
   boolean optimize_scans; /* TRUE=optimize progressive coding scans */
   boolean trellis_quant; /* TRUE=use trellis quantization */
   boolean trellis_eob_opt; /* TRUE=optimize for sequences of EOB */